<template>
  <div>
    <el-container>
      <!-- 头部区域 -->
      <el-header>
        <div class="logo">
          <img src="../../assets/heima.png" alt="电商管理系统" />
          <span>电商管理系统</span>
        </div>
        <el-button @click="logout">退出</el-button>
      </el-header>
      <el-container>
        <!-- 侧边栏区域 -->
        <el-aside :width="isCollapse ? `64px` : `200px`">
          <div class="toggle-button" @click="toggleCollapse">|||</div>
          <el-menu
            background-color="#333744"
            text-color="#fff"
            active-text-color="#409eff"
            :default-active="activePath"
            :unique-opened="true"
            :collapse="isCollapse"
            :collapse-transition="false"
            :router="true"
          >
            <!-- 一级菜单 -->
            <el-submenu
              :index="`${item.id}`"
              v-for="item in menulist"
              :key="item.id"
            >
              <!-- 一级菜单的模板区域 -->
              <template slot="title">
                <!-- 图标 -->
                <i :class="iconsObj[item.id]"></i>
                <!-- 文本 -->
                <span>{{ item.authName }}</span>
              </template>
              <!-- 二级菜单 -->
              <el-menu-item
                :index="`/${iitem.path}`"
                v-for="iitem in item.children"
                :key="iitem.id"
                @click="saveNavState(`/${iitem.path}`)"
              >
                <template slot="title">
                  <i class="el-icon-menu"></i>
                  <span>{{ iitem.authName }}</span>
                </template>
              </el-menu-item>
            </el-submenu>
          </el-menu>
        </el-aside>
        <!-- 主体显示区域 -->
        <el-main>
          <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
  </div>
</template>

<script>
export default {
  name: 'home',
  data() {
    return {
      menulist: [],
      iconsObj: {
        125: 'iconfont icon-yonghu',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao',
      },
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    //获取所有的菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
    },
    //点击按钮，切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    //保存当前点击的路径信息
    saveNavState(activePath){
      this.activePath=activePath
      window.sessionStorage.setItem('activePath',activePath)
    }
  },
  created() {
    this.getMenuList()
    this.activePath=window.sessionStorage.getItem('activePath')
  },
}
</script>

<style lang="scss"  scoped>
.el-container {
  height: 100vh;
  .el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #ffffff;
    font-size: 20px;
    div {
      display: flex;
      align-items: center;
      span {
        margin-left: 15px;
      }
    }
  }
  .el-aside {
    background-color: #333744;
    .el-menu {
      border-right: none;
    }
  }
  .el-main {
    background-color: #efefef;
  }
}
.iconfont {
  margin-right: 10px;
}
.toggle-button {
  background-color: #4a5064;
  color: #ffffff;
  font-size: 10px;
  line-height: 24px;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>